<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>canvas01</title>
<style>
.box { width:100%; height:500px; margin:0 auto; position:relative;}
.box canvas { position: absolute; top: 0; left: 0; width:100%; height:100%;}
</style>
</head>

<body>
<div class="box">
	<canvas id="canvas_name"></canvas>
</div>
<script src="js/canvas01.js"></script>
</body>
</html>
